- Joined
- Oct 31, 2014
- Messages
- 441
Whatever you do, don't depend on some external device. Learn and use something in your head for doing rough figuring. And a "lookup table" for closer figuring. The electronic devices make things go faster but you must know roughly what you're looking for before you start.
60+ years ago I learned about then famous Native American Chief SOH CAH TOA - Mnemonic for trigonometric functions of a right triangle:
Sine =Opposite / Hypotenuse
Cosine = Adjacent / Hypotenuse
Tangent = Opposite / Adjacent
Still with me - like an earworm of 'It's a Small World'
And growing up with a slide rule instead of a calculator the first approximation was done mentally so you'd put the decimal point in the right place and not figure 300 / 12 was 288 due to fat thumbing the wrong function key.
I still have a few slide rules strategically placed around the house - no better tool for quickly re-proportioning a ratio!
Stu